CN106788703A - The OAM detection means of OV light beams - Google Patents
The OAM detection means of OV light beams Download PDFInfo
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- CN106788703A CN106788703A CN201611039140.5A CN201611039140A CN106788703A CN 106788703 A CN106788703 A CN 106788703A CN 201611039140 A CN201611039140 A CN 201611039140A CN 106788703 A CN106788703 A CN 106788703A
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- 238000012360 testing method Methods 0.000 description 3
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2581—Multimode transmission
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
- G01J1/4257—Photometry, e.g. photographic exposure meter using electric radiation detectors applied to monitoring the characteristics of a beam, e.g. laser beam, headlamp beam
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0795—Performance monitoring; Measurement of transmission parameters
- H04B10/07955—Monitoring or measuring power
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/80—Optical aspects relating to the use of optical transmission for specific applications, not provided for in groups H04B10/03 - H04B10/70, e.g. optical power feeding or optical transmission through water
- H04B10/801—Optical aspects relating to the use of optical transmission for specific applications, not provided for in groups H04B10/03 - H04B10/70, e.g. optical power feeding or optical transmission through water using optical interconnects, e.g. light coupled isolators, circuit board interconnections
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- Optics & Photonics (AREA)
- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Optical Couplings Of Light Guides (AREA)
Abstract
A kind of OAM detection means of OV light beams is disclosed herein, including：DMD DMD, lens, multi-module optical fiber coupler, multimode fiber array and light power meter；Wherein, the lens are arranged at the diffraction pattern that the DMD is produced；The multi-module optical fiber coupler is arranged on the focal plane of the lens, and is connected to the multimode fiber array；The multi-module optical fiber coupler is accessed in one end of the multimode fiber array, and the other end connects the light power meter.The OAM detection means of this paper, can carry out parallel detection to the energy of multichannel OV light beams, substantially increase detection efficiency, and capacity usage ratio is greatly improved, and operate also more convenient and reliable.
Description
Technical field
The application is related to technical field of photo communication, more particularly to a kind of optical vortex (Optical Vortices, OV) light
Orbital angular momentum (Orbital Angular Momentum, OAM) detection means of beam.
Background technology
With the extensive use developed rapidly with dense wave division multipurpose (DWDM) technology of optical communication technique, for optical signal
Transmission, the device for the treatment of develop to highly integrated and array direction, and various high-performance and ultrahigh speed exchange system are each to its inside
High density, high bandwidth and low-loss requirement are proposed between element with the communication connection between outside other systems.With
Increase to bandwidth demand, electrical interconnection has become a bottleneck between high speed processor and express network.Taken with light network
In generation, is electrically interconnected, and has become inevitable development trend.Meanwhile, with the development of the concurrent techniques such as paralleling multi-processor, parallel light
Interconnection has been obtained for extensive attention.Light network be using photon as information carrier come realize the information between computing unit hand over
Change.Because the speed of light network is high, light wave independent propagation is noiseless, number of interconnections it is big, interconnection density is high, low in energy consumption, be avoided that
" electronic bottleneck " and the advantages of wavelength channel can be realized, in computer systems, the application of the aspect such as the information processing technology be
Essential, it is mainly manifested in data exchange, eliminates the aspects such as " electronic bottleneck " and topological structure.The classification of light network is from knot
From the point of view of structure, can be divided into：The interconnection between interconnection, computer between interconnection, circuit board between interconnection, chip in chip；
From the point of view of used channel is interconnected, can be divided into：Optical fiber interconnections, waveguide interconnection, free-space interconnection etc..Various structures have each
The information processing function.Meanwhile, light network technology communication bandwidth, etc. the aspect such as journey transmission, electromagnetism interference and low energy consumption and
It is electrically interconnected to compare and also has big advantage.
Optical vortex (Optical Vortices, OV) is the light beam that a kind of wavefront direction of propagation has spiral form.
When phase of light wave has screw type wavefront structure, wavefront can in a spiral manner rotate around direction of propagation axle.Optical vortex light
Son all has the orbital angular momentum (Orbital Angular Momentum, OAM) for determiningOrbital angular momentum is to characterize optics
The characteristic parameter of vortex.Due to the interference cancellation of vortex light beam itself, the far field construction pattern of light beam seems to be exactly a light
Bright ring, the center portion thereof point is in blackening.Screw type wavefront and phase singularity are exactly its two principal character.Spiral phase according to electric field
Position rotates 2 π integral multiples in one wavelength light path of propagation around optical axis, and different orbital angular momentum light beams can use topological charge L
(Topological Charge) is characterized, and L can use arbitrary integer.It is theoretical to show with experiment, this orbital angular momentum light beam
Each photon in light field has specific orbital angular momentum L.The possibility span of L is all integers in theory.Therefore can
Numerical Control is completed with using the topological charge of optical vortex, can fully be applied and be believed in photon calculating, superconducting thin film, quantum
The aspects such as breath, FSO.
In correlation technique, the test side of OAM detecting systems is to wherein signal is detected all the way with single-mode fiber.It is first
First, it is necessary to by the OAM signals revivifications of coaxial multichannel into Gauss point, will wherein Gauss point is coupled into single-mode fiber all the way, recycle
Light power meter obtains the energy size of the road signal, and this mode is not only cumbersome, and measuring result error is larger.
Based on above reason, it is necessary to a kind of OAM detection schemes that can realize parallel detection and lifting detection efficiency.
The content of the invention
To solve existing technical problem, the embodiment of the present invention provides a kind of OAM detection means of OV light beams.
To reach above-mentioned purpose, what the technical scheme of the embodiment of the present invention was realized in：
A kind of orbital angular momentum OAM detection means of optical vortex OV light beams, including：DMD DMD, lens,
Multi-module optical fiber coupler, multimode fiber array and light power meter；Wherein,
The lens are arranged at the diffraction pattern that the DMD is produced；
The multi-module optical fiber coupler is arranged on the focal plane of the lens, and is connected to the multimode fiber array；
The multi-module optical fiber coupler is accessed in one end of the multimode fiber array, and the other end connects the light power meter.
A kind of OAM detection means of OV light beams is the embodiment of the invention provides, using multimode fiber array to carrying OAM's
Coaxial multiple signals are coupled simultaneously, in the test side of optical communication system by coaxial multichannel OAM signals revivifications into Gauss point, Ran Houzhi
Connect and be coupled into multimode fiber array, parallel detection is carried out such that it is able to the energy to multichannel OV light beams, substantially increase detection
Efficiency, capacity usage ratio is greatly improved.
Additionally, being detected using multimode fiber array in the embodiment of the present invention, operate also more convenient and reliable.
Brief description of the drawings
In accompanying drawing (it is not necessarily drawn to scale), similar reference phase described in different views
As part.Similar reference numerals with different letter suffix can represent the different examples of similar component.Accompanying drawing is with example
Unrestricted mode generally shows each embodiment discussed herein.
Fig. 1 is the OAM detection means frame diagrams of the road OAM signals of parallel detection 49；
Fig. 2 is 7 × 7 multi-module optical fiber coupler schematic diagrames；
Fig. 3 is incidence DMD light path schematic diagrams under Flat states；
Fig. 4 is incidence DMD light path schematic diagrams under ON states；
Fig. 5 is the locus schematic diagram under Flat states by m=1 grades after f=40mm lens；
Fig. 6 be Flat states under by 7 × 7 array arrangements after f=40mm lens；
Fig. 7 be ON states under by 7 × 7 array arrangements after f=40mm lens.
Specific embodiment
The application provides a kind of OAM detection means, and the device can include：Multi-module optical fiber coupler, lens, DMD, multimode
Fiber array and light power meter；Wherein, the lens are arranged at the diffraction pattern position that the DMD is produced；The multimode
Fiber coupler is arranged on the focal plane of the lens, and is connected to the multimode fiber array；The multimode fiber array
The multi-module optical fiber coupler is accessed in one end, and the other end connects the light power meter.
In some implementations, the DMD panels can be into the coaxial multichannel OV light beams for carrying multichannel OAM signals
24 ° of angles, to reach maximized Detection results.
In the application, the OAM detection means of OV light beams is related to FSO Parallel detection, to coaxial many
The restoration point that road carries OAM signals carries out coupling simultaneously.Specifically, coaxial multichannel is reduced using multimode fiber array
OAM signals carry out coupling, parallel detection simultaneously.Multimode fiber array is positioned over the focal plane of lens, multichannel OAM signal quilts
Multiple Gauss points are reduced into, and are assembled at lens focus, multiple Gauss points are directly coupled into multimode light at lens focus
Fibre array, the size of its energy is detected to any road signal parallel.In this way, realizing that multichannel is answered using the orthogonality of OV light beams
With, the capacity of the information transmission system is increased substantially, coaxial multichannel OAM restoration points are coupled simultaneously using fiber array, significantly
Detection efficiency is improve, and capacity usage ratio is greatly improved.
As shown in figure 1, being the OAM structure of the detecting device schematic diagrames of the road OAM signals of parallel detection 49.Can include：Multimode
Fiber array 11, multi-module optical fiber coupler 12, lens 13, DMD14.As shown in figure 1, the coaxial OV light beams 10 for carrying OAM pass through
After the DMD14 diffraction of the Dammann grating holograms for loading different particular designs, the array of 7 × 7 is produced in space,
Focus on, the OAM signals revivifications of these coaxial multichannels into one or more Gauss points in lens in space by after lens 13
13 focal plane places multi-module optical fiber coupler 12, and one or more Gauss points being reduced are coupled into multimode fiber array
In 11, light power meter (not shown in figure 1) is accessed in the other end of multimode fiber array 11, light power meter can determine road letter
The energy size in road, reaches the purpose of parallel detection.In practical application, its knot can be adjusted according to the light path quantity of OV light beams
Structure, particularly, can according to input coaxial OAM number of signals and lens focal length size adjustment multimode fiber array 11 and
The structure of multi-module optical fiber coupler 12, specific adjustment mode can refer to the example shown in Fig. 1, will not be repeated here.
It is illustrated in figure 2 the schematic cross-section of multi-module optical fiber coupler.According to the focal length of different lens, can use various
The multi-module optical fiber coupler of 7 × 7 arrays.Each multi-module optical fiber coupler is 7 × 7 multimode fibres to that should have two panels, shown in Fig. 2
Array, white point correspondence accesses 49 root multimode fibers, and multi-module optical fiber coupler correspondence is positioned over Jiao of different focal lens
At plane, correspondence is coupled into the multi-module optical fiber coupler by coaxial multichannel OAM signals are reduced into after Gauss point, in this way,
It is capable of achieving the parallel detection of any road OAM signals.
Have program stored therein data in the memory of the DMD, and described program data cause that the multichannel for inciding DMD panels is same
Axle OV light beams are exported to region set in advance in the form of diffraction.In practical application, the substrate of DMD is silicon, with extensive collection
Memory is made on silicon chip into circuit engineering, each memory there are two addressing electrodes (address electrodes) to set
On two support columns, a minitype reflector is installed by hinge (torsion hinge), just like the structure of " seesaw ".
Each micro-reflector can reflect away light from both direction, actual reflection direction then regarding bottom memory cell state and
It is fixed；When memory cell is in " ON " state, speculum can be rotated to+12 degree, if memory cell is in " OFF " state, reflection
Mirror can be rotated to -12 degree, in addition, not adding address signal speculum then to correspond to 0 degree of " Flat " state.That is, DMD each list
There are three stable states in unit：+ 12 degree, -12 degree, 0 degree.As long as with reference to DMD and appropriate light source and projection optical system, microreflection
Mirror will be reflected into incident light or leave the loophole of projection lens so that the speculum of " ON " state becomes clear very much, "
The speculum of OFF " states is dark.GTG effect can be obtained using two bit pulse length modulations, if using fixed or rotation
Rotatable color filter, then arrange in pairs or groups one or three dmd chips, you can obtain color display effect.In practical application, can pass through
The routine data of computer write-in DMD in its memory, so that the light beam that will incide DMD panels is exported in the form of diffraction
To region set in advance, the region set in advance can be the position that lens are placed, and the position after lens focus is many
The locus of mode fiber array.
In practical application, DMD main working method is the unlike signal that CMOS chip is passed to according to back-end circuit, is adjusted
The rotation position of each micro mirror in control wafer, and then cause that the light being radiated on micro mirror selectively reflects different directions.DMD
Circuit portion, Machinery Ministry and optical section can be included.Wherein, circuit portion is control circuit, and Machinery Ministry is used to control what eyeglass was rotated
Mechanical structure, optical section includes rotatable eyeglass, and the eyeglass is distributed on DMD panels, and volume is small.When DMD normal works
When, light enters DMD, and the eyeglass on DMD panels reflects the light by rotating, the rotation of each eyeglass
Controlled by the circuit portion.
In the application, energy is fifty-fifty distributed between each diffraction time and the Modulation and Amplitude Modulation hologram of DMD binaryzations is write,
7 × 7 array is exported into 7 × 7 multimode fiber array of correspondence, DMD loading DMD loading binaryzation Modulation and Amplitude Modulation holograms are used
In the OAM signals for reducing coaxial multichannel,.In this way, in the test side of optical communication system, by multimode fiber array, can be direct
The energy size on any road is measured, the purpose of parallel detection is reached, the detection efficiency of system is greatly improved.Further, since multimode
Optical fiber is thicker than single-mode fiber core diameter, and numerical aperture is big, can be from the more luminous powers of light source couples, and operating conveniently can than single mode device
Lean on.
In practical application, the OV light beams of coaxial multichannel of multichannel OAM signals are carried by after free space transmission, in detection
Produced in space by loading the DMD (DMD, Digital Micromirror Device) of different holograms at end
The a series of diffraction pattern of life, by being assembled in the focal plane of lens after lens focus, according to reflection-type grating equation and DMD
Diffraction property can determine that space of 7 × 7 arrays (i.e. the coaxial OAM signals in 49 tunnels) under different focal lens focus is sat
Mark, the space coordinates is the space coordinates of 7 × 7 multimode fiber array, so, it may be determined that the specific space of multimode fiber array
Position, to obtain accurately receiving the coaxial OAM signals in 49 tunnels, and then measures the energy size of OAM signals, reaches parallel detection
Purpose.
In some implementations, the space coordinates of the multimode fiber array is different because the stable state of the DMD is different.
Describe the determination method of multimode fiber array space coordinates in detail by taking 7 × 7 multimode fiber array as an example below.
The circular of 7 × 7 multimode fiber array space coordinates may include steps of：
(1) as shown in figure 3, when DMD is in Flat states, Dammann gratings, screen periods d are loaded with DMD1=
In 0.157mm, Fig. 3 without arrow dotted line be incident light normal, a length of 1550nm of incident light wave, i=8 ° of incidence angle, θ0=i=
0.1396 (radian), according to grating equation d1(sini-sinθ1)=m λ obtain the diffraction angle in m=1 levels1=0.1297 (arc
Degree).
(2) as shown in figure 4, when DMD is in ON states, the microlens array on DMD overturns 12 °, and DMD starts working,
Keep incident angle of light constant, normal now is for, without shown in arrow dotted line dotted line, now, incident angle of light is i'=in Fig. 4
20 °, screen periods are the cycle d of DMD eyeglasses2=13.68 μm, according to grating equation d2(sini'-sinθ′1=m λ are spread out
The diffraction angle ' penetrated in level m=1 levels1=0.2307 (radian).
(3) as shown in figure 5, after the eyeglass of DMD is rotated, m=1 grades now is glittered onto the level of higher level, and
Diffraction spectra wire clamp angle for same m=1 grades has：α=Δ θ-Δ i=(θ '-θ)-(i'-i), according to the formula, calculates m=
The spectral line angle α of 1 grade of DMD under two states1=(θ '1-θ1)-(i'-i)=- 0.1085 (radian).
(4) calculate under Flat states, m=1 grades of difraction spectrum space coordinates：
When m=1 grades of difraction spectrum after the lens focus of f=40mm by having：L=ftan (θ0-θ1)=0.396mm, i.e.,
The distance of point 7 is arrived for Fig. 6 midpoints 0.
(5) calculate under Flat states, by after the lens focus of f=40mm, the space coordinates of 7 × 7 arrays, by (4)
The distance for obtaining a little 0 to point 7 is L=0.396mm, and as m=1 grades of position, according to above-mentioned steps (1) (2) (3) (4), obtains
M=2 grades of position (point 8) and m=3 grades of position (putting 9), are calculated and a little 0 arrive point 8 apart from being 0.7961mm, put 0 and arrive point 9
Distance is 1.1964mm.In the case where DMD is Flat states, 7 × 7 arrays are arranged for square, distance, point 0 according to point 0 to point 7
To the distance of point 8 and point 0 to 9 distances of point, the space coordinates of every bit in the array can be obtained, this space coordinates is Flat shapes
The space coordinates of 7 × 7 multimode fiber array under state.
(6) calculate under ON states, by after the lens focus of f=40mm, the space coordinates of 7 × 7 multimode fiber array：Such as
Shown in Fig. 7, array now is rhombus arrangement, and y directions position coordinates keeps constant, and in the x direction due to diffraction time
Change, has a stretching for transverse direction, from angle is changed into π/4+ α between point 7 and y-axis knowable to (2)1, can be with the basis of (5)
The position coordinates of this time point 7 is obtained, and puts 7 for the intermediate point between point 1 and point 4,1 position of point is constant, you can try to achieve a little 4 position
Put coordinate.In conjunction with the coordinate of every bit in available now 7 × 7 arrays of structure of (5), the as sky of multi-module optical fiber coupler
Between coordinate.In conjunction with the focal length f of different lens, you can obtain the sky that various different focal f focus on lower 7 × 7 multimode fiber array
Between coordinate.
The above, only presently preferred embodiments of the present invention is not intended to limit the scope of the present invention.
Claims (7)
1. the orbital angular momentum OAM detection means of a kind of optical vortex OV light beams, it is characterised in that including：DMD
DMD, lens, multi-module optical fiber coupler, multimode fiber array and light power meter；Wherein,
The lens are arranged at the diffraction pattern that the DMD is produced；
The multi-module optical fiber coupler is arranged on the focal plane of the lens, and is connected to the multimode fiber array；
The multi-module optical fiber coupler is accessed in one end of the multimode fiber array, and the other end connects the light power meter.
2. OAM detection means according to claim 1, it is characterised in that the DMD and coaxial multichannel OV light to be detected
Into specified angle, the coaxial multichannel OV light beams carry multichannel OAM signals to beam.
3. OAM detection means according to claim 2, it is characterised in that the DMD is with OV light beams to be detected into 24 °
Angle.
4. OAM detection means according to claim 1, it is characterised in that the lens are arranged on apart from the DMD panels
2cm to 3cm locates, and keeps the diffraction pattern that the DMD is produced to be located at the center of the lens.
5. OAM detection means according to claim 1 and 2, it is characterised in that coaxial multichannel OV light beams to be detected are 49
During the coaxial OV light beams in road, the multimode fiber array is 7 × 7 multimode fiber array, and the multi-module optical fiber coupler is 7 × 7 times
The multi-module optical fiber coupler of row.
6. OAM detection means according to claim 1, it is characterised in that the DMD includes memory, the memory
In have program stored therein data, described program data cause that the coaxial OV light beams of the multichannel for inciding DMD panels are defeated in the form of diffraction
Go out to region set in advance, and by corresponding OAM signals revivifications into Gauss point, for the detection of OAM signals.
7. the OAM detection means according to claim 1 or 6, it is characterised in that the space coordinates of the multimode fiber array
It is different because the stable state of the DMD is different.
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| CN201611039140.5A CN106788703B (en) | 2016-11-21 | 2016-11-21 | The OAM detection device of OV light beam |
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| CN113884180A (en) * | 2021-09-29 | 2022-01-04 | 歌尔光学科技有限公司 | System, method and device for testing diffraction light waveguide |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109060124A (en) * | 2018-08-10 | 2018-12-21 | 中南民族大学 | The identifying system of communication beam orbital angular momentum mode based on digital micro-mirror |
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| CN111596410A (en) * | 2020-04-12 | 2020-08-28 | 桂林电子科技大学 | Reflective orbital angular momentum light beam converter adaptive to special optical fiber |
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| CN113884180A (en) * | 2021-09-29 | 2022-01-04 | 歌尔光学科技有限公司 | System, method and device for testing diffraction light waveguide |
| CN113884180B (en) * | 2021-09-29 | 2024-03-12 | 歌尔光学科技有限公司 | Testing system, method and device for diffraction optical waveguide |
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